Neutral Hydrogen Content of Dwarf Galaxies in Different Environments  

作　　者：Hui-Jie Hu Qi Guo Pablo Renard Hang Yang Zheng Zheng Yingjie Jing Hao Chen Hui Li 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute for Frontiers in Astronomy and Astrophysics,Beijing Normal University,Beijing 102206,China [4]Department of Astronomy,Tsinghua University,Beijing 100084,China [5]Research Center for Intelligent Computing Platforms,Zhejiang Laboratory,Hangzhou 311100,China

出　　处：《Research in Astronomy and Astrophysics》2023年第11期99-111,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National SKA Program of China(Nos.2022SKA0110201 and 2022SKA0110200);CAS Project for Young Scientists in Basic Research grant No.YSBR-062;the National Natural Science Foundation of China(NSFC)(grant Nos.12033008,11622325,11988101);the K.C.Wong Education Foundation;the science research grants from the China Manned Space Project(CMSP)with NO.CMS-CSST-2021-A03 and NO.CMS-CSST-2021-A07;support of the Tsinghua Shui Mu Scholarship;NSFC(grant No.12073014);the science research grants from the China Manned Space Project with No.CMS-CSST2021-A05;Tsinghua University Initiative Scientific Research Program(No.20223080023);supported by NSFC(grant Nos.11988101,12041302,and U1931110);supported by the science research grant from the China Manned Space Project with grant No.CMS-CSST-2021-A08;support from the European Union's Horizon 2020 Research and Innovation Programme under the Marie Sk?odowska-Curie grant agreement No.101086388;supported by the Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS;supported by the Key Research Project of Zhejiang Lab(No.2021PE0AC03)。

摘　　要：Environments play an important role in galaxy formation and evolution,particularly in regulating the content of neutral gas.However,current HI surveys have limitations in their depth,which prevents them from adequately studying low HI content galaxies in high-density regions.In this study,we address this issue by employing the Five-hundred-meter Aperture Spherical radio Telescope with extensive integration times to complement the relatively shallow Arecibo Legacy Fast Arecibo L-band Feed Array HI survey.This approach allows us to explore the gas content of dwarf galaxies across various environments.We observe a positive relationship between HI mass and stellar mass in dwarf galaxies,with a well-defined upper boundary for HI mass that holds true in both observations and simulations.Furthermore,we find a decrease in the H I-to-stellar mass ratio(M_(HI)/M_*)as the density of the environment increases,irrespective of whether it is determined by the proximity to the nearest group or the projected number density.Comparing our observations to simulations,we note a steeper slope in the relationship,indicating a gradual gas-stripping process in the observational data.Additionally,we find that the scaling relation between the M_(HI)/M_*and optical properties can be improved by incorporating galaxy environments.

关 键 词：galaxies:dwarf galaxies:evolution galaxies:formation galaxies:statistics 

分 类 号：P15[天文地球—天文学]